Carbureter for internal-combustion engines.



G. P. BULL.

GARBURETER FOR INTERNAL GOMBUS'ION ENGINES.

APPLICATION FILED MAR. 25, 1912. l 1,1 1 6,985, Patented Nov. 10, w14.

2 SHEETS-SHEET 1.

vvnrmisss;` '1 mvENToR ge'olyezuzz G. P. BULL.

GARBURETER POR INTERNAL GOMBUSTION ENGINES.

APPLICATION FILED MAB.. 25, 1912.

Patented Nov. 10, 1914.

2 SHBETS*SHEET 2.

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INVEN,TO%0, @E Bag GEQRGE FREDERICK BULL, 0F BIRMINGHAM, ENGLAND.

CARBUBETEB FOB INTERNALFGOMBUSTION: ENGrIN'IilS.-

Spgciication or'Letters Patent.

.Patented Nov. 10,1 12114.

Appiianon mea Maren 25, 191e. serial No. 635,990.

TQ all/whom it may concern Be it known that I, GEORGE FREDERICK BULL, asubject of the King of Great Britain, residing aty Birmingham, England,have inventedy certain new and useful Improvements in Carbureters forInter1ial-Comb11s tion Engines, of' which the following is aspeciication.

This invention /relates to carbureters for interna-l combustion enginesprincipally of that type in which the fuel is sprayed and atomized by acurrent of air which is drawn, by the suction of' the engine, past thefuel nozzle, the proper explosive mixture being produced by means of anindependent supply of air, also drawn in by the suction of the engine,which meets and mixes with the said spray. l

The principal object of the present invention is to provide an improvedconstruction.

of this type of carbureter in which a more thorough atomizing of thefuel is insured, and a more perfect and intimate mixture of the main airsupply with the sprayed fuel obtained, thus producing a more perfect eX-plosive charge.

Figure 1 of the accompanying drawings is a side elevation of' acarburetor constructthe carbureter, the float-feed chamber being show-nin elevation. Fig. 3 is a horizontal Y section. Fig. 4 is across-section on line fr Fig. 2. Fig. 5 is a section on line w1, Fig. 2,showing the air regulator. Fig. 6 is a section on line Fi 2. Fig. 7 is aview showing the floatleed chamber and fuel nozzle detached from the-body of the carbureter. Fig. 8 is a section on line ma Fig. 2.

The same reference numerals indicate corresponding parts in each of thefigures of the drawings.

The body of the carburetei` comprises an outer cylindrical shell orcasing 1 contracted at one end, which is adapted to be connected withthe induction pipe of the engine by a union 2, and is somewhat enlargedat `its opposite end, at 3. It is fitted within its interior with aremovable liner or sleeve 4, of smaller diameter, having an enlargedconed rear end 5. This said end is fitted with a t1 ansverse diaphragm 6formed with a series of air-inlet openings 7 leading into a vchamber 8formed by the enlarged part 3 of the casing 1, the walls of the chamberbeingl provided with a number of peripheral openings 9 leading to theexterior and through which is'drawn the air supply for diluting andforming the mixture. rl`his diluting supply is controlled `by a rotatingregulator consisting of a, disk 10 mounted behind the transversediaphragm 6. upon a central sleeve or hollow boss 11 carried by thelatter, and having a number of openings 12 adapted to be brought more orless into register with those of the -said diaphragm.

It is preferably operated by a suitable transmission device actuated bya lever from the handle-bar (in the case-otI a motor-cycle) o'r otherpart. In the construction illustrated, one side of the casing 1 carriesa. vertical tubular housing 13 (shown in sec- 'tion in Fig. 6) towhoselupper end the outer stationary element or casing 14 of thetransmission device may be attached by a screw cap 15. The'inner wireelement 16 is at? tached to an externally threaded part 51 screwing intoa hollowplunger 17. having a forked lower-end contained within a loosesleeve 34 fitted in the housing 13, and having a transverse pin 1Scrossing the forked part. By screwing the part 51 more or less into theplunger the length of the cable can be adjlusted. The pin 18 engageswith a slotted end of an arm 19 carried by the air regulator 10, andwhich eXtend-s'through a slot 20 in the sleeve 34. The plunger issurrounded by a spring 21 which tends to depress the same so as to closethe air inlets. Byoperating the control lever (not show-n) the plungeris raised and' loweredl so as to more or less open and close the airinlets.

The rear of the air-inlet chamber 8 is closed by a cone 22 looselyittingwithin the open end of the casing 1 and` provided with a nozzle 23which extends horizontally through the air-inlet'chamber and projectsinto the main part oi the bodywhich forms the mixing chamber, saidnozzle which has a small orifice) being supported by the central sleeve11 carried by the air-inlet diaphrag'm 6. Through this cone 22 the airfor spraying the fuel is draw-n by the suction of the engine, said conebeing provided adjacent its outlet end with an internal annularconstriction 39 which serves to produce an increased velocity at thatpoint.

The rear part of the body carries a setdown bracket 24 which supportsthe oatfeed chamber 25 and is provided with vertical curved side walls26, which embrace and llit around the front portion of said chamber.

There is thus Jformed between the latter and the cone 22 a chamber 27(Fig. 3) which 'communicates with the exterior through openings 28 inthe sides, forming an area of undisturbed air from which Athe air forforming the spray is drawn. The float chamber 25 is detachably securedto the carrier bracket 24, for which purpose the latter islongitudinallyslotted at 29 to receive the supply branch 30 at thebottom, said branch 30 being fitted with a nut '31 by the screwing up ofwhich the chamber can be rigidly secured in position. The said chamber25 carries at its lower end a forwardly extending bracket piece or block32 which passes through an opening 33 in the vertical wall 26 of thebracket 2l, and extends horizontally beneath the carbureter body. It isdrilled with a horizontal fuel passage 35 which terminates in a verticalhble 36 'into which a vertical petrol nozzle 37 ,is sc rewed, said'passage registering with a corresponding passage 38 in the nozzle. Thelower end of the latter is coned to engage with an' internally conedpart of the hole 36. The said 'nozzle passes into the interior of themixing chamber and its upper end is coned and lits within a conicalrecess in the underside of the air nozzle 23 at the point wheretheconstruction 39 is provided, so as to extend into the bore of thesaid air nozzle at right angles thereto. By removing the fuel nozzle andslackening the fixing nut 31 of the supply branch 30 the float chamber25 can be slid rearward away from the body, as in Fig. 7. The suctionof-the engine causes a strong current of air to bedrawn through theopenings 28 and the cone 22 and across the petrol jet 37,therebyinducing a flow of petrol which is immediately atomized andsprayed by the said air. At the same time the suction draws the dilutingsupply of air through openings 9 into the inlet chamber 8 and past theregulator, whence it enters the mixing chamber 'co-axially orconcentrically with the spraying air jet issuing through the nozzle 23and intimately mixes with the spray for forming the explosive mixture.

The throttle valve 40 is of the butterfly type and is operated by atransmission device in a similar manner to the air regulator, previouslydescribed. Thus, the casing l has a tubular housing ,41 containing asleeve 42 (Fig. 8), and having attached to its upper end, by means of ascrew-cap 43, the outer member 44 of the transmission device.

The inner wire member 45 is attached to a plunger 46 surrounded by aspring 47 and having a forked lower end 48 provided with a pin 49engaging with the slotted end of an Having fully described myinvention,l

said end land having a. horizontal nozzle through which air is drawn bythe suction of the engine, solelyI for spraying the fuel, a chamberbetween said oat chamber and the air-inlet cone provided with inletopenings in its side walls, and a vertical fuel nozzle arranged at rightangles to the nozzle of said air-inlet cone' so that the fuel isvsprayed by the air issuing from the latter,

the peripheral Wall of the rear end of the carbureter body havingair-inlet openings through which the diluting air supply is drawn by thesuction of the engine concentrically with the irst-named nozzle formixing with the sprayed fuel and forming the proper explosive charge,substantially as herein described and set forth. l

2. A carbureter comprising a horizontal body part, a vertical fuelnozzle extending into the interior of the body, a transverseperforateddiaphragm at the rear Jend of the' body, a. rotary airregulator disk arranged. against the facey of the diaphragm and havingopenings adapted to be turned more vor less into register with theopenings in the diaphragm, an air-inlet cone provided with a horizontalnozzle through which air is drawn by the suction of the engine, saidnozzle passing through and being supported by said .diaphragm, and anair-inlet chamber located between the airl regulator and the funnel,-

portion of the float-feed chamber, a supply branch at the bottom of saidchamber received in said slot to admit of the chamber being detached bysliding it rearward, and a nut on' the supply branch for securing thesaid chamber in position.

4; A carbureter comprising a horizontal body, a -set down bracket at therear end thereof having-a longitudinal slot and an opening, a float-feedchamber detachably supported by said bracket, curved side Walls carriedby the bracket which partially embrace the front portion of theHout-feed chamber, a supply branch at the bottom of said chamberreceived in the slot in said bracket, a nut on the supply branch forselcuring the said chamber 1n position, an airnarcose and havin@1 ahorizontal nozzle through Which air is drawn by thejsuction o' theengine solely for spraying the uel, a cham` ber between the floatchamber/and the cone having inlet openings in its sidewalls, a forwardlyextending block carriedvby the iloat chamber and passing throughthe/opening Ali) in said bracket, and having a longitudinal fuelpassage, and a vertically arranged detachable fuelnozzle carried by saidblock and extending into the body at right. angles to the air nozzle sothat the fuel is sprayed by the air issuing from the latter, theperipheral Wall of the rear endo the carbureter body having air-inletopenings through which the diluting air supply is drawn by the suctionof the engine concentrically with the central t/spraying nozzle formixing with the sprayed fuel and forming the proper explosive charge. A

5. A. carbureter comprising a horizontal body part, a vertical fuelnozzle extending into the interior of the body, an air inlet funnel atone endof the body, and a central horizontal spraying nozzle oi. smallbore carriedby said funnel and through which a current of air usedsolely for spraying the fuel is drawn by the suction of the engine, saidspraying nozzle being arrangedabove and at right angles to the fuelnozzle and having its forward portion provided with an internal annularconstriction which is formed at the under side thereof with a re cessopening into its bore and receiving therein the upper end oi' said fuelnozzle to produceA an increased velocity adjacent to the said upper endof said fuel nozzle, the carbureter body having air-inlet openingsthrough which the diluting air supply is drawn by the suction of theengine to mix with the sprayed fuel and form the propel-` a spraying-nozzle carried by said vfunnel and through which a currentl of air usedsolely for spraying the fuel is drawn by the suction of the engine, saidspraying nozzle extending at one end across and beyond the coned end ofsaid fuel nozzle and having its bore formed adjacent said end with anannular constriction, the under side of the vspraying nozzle beingformed with a conical seat which opens into said constriction andreceives the coned end-0f the fuel nozzle, to produce anincreasedvelocity adjacent to the said coned end of said fuel nozzle, one Wall ofsaid carburetor body being provided with air-inlet openings throughwhich the diluting air supply is drawn by the suction ofthe engine tomix with the sprayed fuel and forni the proper explosive charge.

ln testimony ivhereof l haveV hereunto slet A my hand in presence of twosubscribing witnesses.

esoneri FREDERICK BULL.

Witnesses Hnnnr Sxznnn'r'r HENRY NoirroN xnnunrr.

